She's not an angry loner type, she just has some trust issues (I'm sure you would too if your family was ready to sell you to pay off their debts). But yeah, having a mutual seller they fence their goods off too would make the most sense to establish their relationship.

As for Mia, her goal is just trying to make sure her younger brothers are okay, since she hasn't had contact with her family for several years she just wants t make sure they're okay.